1. What is a mac address? In computer networking a Media Access Control address (MAC address) or Ethernet Hardware Address (EHA) or hardware address or adapter address is a quasi-unique identifier attached to most network adapters (NICs Network Interface Card). It is a number that acts like a name for a particular network adapter, so, for example, the network cards (or built-in network adapters) in two different computers will have different names, or MAC addresses, as would an Ethernet adapter and a wireless adapter in the same computer, and as would multiple network cards in a router. However, it is possible to change the MAC address on most of today's hardware, often referred to as MAC spoofing. Most layer 2 network protocols use one of three numbering spaces managed by the IEEE: MAC-48, EUI-48, and EUI-64, which are designed to be globally unique. Not all communications protocols use MAC addresses, and not all protocols require globally unique identifiers. The IEEE claims trademarks on the names "EUI-48" and "EUI-64" ("EUI" stands for Extended Unique Identifier). MAC addresses, unlike IP addresses and IPX addresses, are not divided into "host" and "network" portions. Therefore, a host cannot determine from the MAC address of another host whether that host is on the same layer 2 network segment as the sending host or a network segment bridged to that network segment. ARP is commonly used to convert from addresses in a layer 3 protocol such as Internet Protocol (IP) to the layer 2 MAC address. On broadcast networks, such as Ethernet, the MAC address allows each host to be uniquely identified and allows frames to be marked for specific hosts. It thus forms the basis of most of the layer 2 networking upon which higher OSI Layer protocols are built to produce complex, functioning networks. (Copy'n'paste: h**p://en.wikipedia.org/wiki/MAC_address) 2. What your gonna need Basicly your gonna need macshift, i found a perfectly fine application by Nathan True, that fits our needs. URL: h**p://devices.natetrue.com/macshift/macshift.zip AND!!! Your going to need a dynamic ip address, wich means you need to have given a DYNAMIC ip address by your ISP! 3. How do we do it? Download the file up there ^, and then copy it to C:\macshift. Step 1. Hit start -> Run, type "cmd", then type "cd C:\macshift".. hit enter. Step 2. Now were going to find the title of the network connection your established to.. Find the information about your network connections.. http://img165.imageshack.us/img165/7605/lanconnectionhl6.jpg On the picture, the title of the network is named 'LAN-forbindelse' at you its probably 'LAN-connection'.. next step is to use macshift. go back to the command prompt you were in before. now type "macshift.exe -i <title of the network here" in my case its "macshift.exe -i LAN-forbindelse" and then hit enter.. voila, the network resets and your back on with a new ip! this of course allso is possible if you have a router.. its just a different method wich i dont know, but look it up at google!